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If clustering of the arrival directions of ultra high energy cosmic rays isdiscovered, this would provide important information about their origin,composition, and the galactic and extragalactic magnetic fields. We presenthere the analysis of the autocorrelation function of the data from the PierreAuger Observatory as a function of the angular scale and the energy threshold.We compare our results with the signals found by previous experiments.

Studies of clustering in the arrival directions of cosmic rays detected at the Pierre Auger Observatory above 10 EeV